It is easier and more economical to
use than conventional methods to obtain greater speech privacy.

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Direct-Field vs Plenum Speakers:
Hype and Reality

Soft dB presented a scientific paper at the 2018 Internoise Conference to measure the performance of a direct versus a plenum sound masking system.
Have a look for yourself, see how a plenum system is still a preferred choice for most office configuration.

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Discover Soft dB's Sound Masking System

What is Soft Sound Masking System ?

“A picture is worth a thousand words” This video explains everything you need to know about the Soft dB Sound Masking System